Automatic ringing circuits



J. F. TOOMIEYi AUTOMATIC HINGING Cl-RCUITS.

APPLICATION msn :UNE 5. 1919.

1,435,348. Patented Nov. 14, 1922.

Patented Nov, i4, 1922.

narran statwr JOHN F. TOONIEY, OF NE YORK, N. Y., ASSIGNOR TO AMERICAN TELPHON TELF-GRAPH COMPANY, A. CORPORATION OF NEV YORK.

I- inane narrar y AND AUTOMATIC amerite CIRCUITS. f

Application filed June 5, 1919. Serial No. 301,927.

T0 all whom 'it may concern:

Be it known that LJoHN F. TooMEY, residing at New York, in the county of New York and State of Newy York, have invented certain Improvements in Automatic Ringing Circuits, of which the, following is a specification.

This invention relatesto automatic ringing circuits. 'i

The object of the invention is to provide application of intermittent ringing vcurrent to the jack of the subscriber with which the operators cord is associated. The locking` circuit of this relay is controlled by two contacts, one of which is opened by the supervisory relay when the subscriber answers, and theother of which is opened when the operator takes down the cordv incase the subscriber fails to answer. The opening of either of these contact stops the .lowrv of ringing current and .causes the circuits to berestored to normal conditions.

The above and other features ofthis invention will be readily understood fromthe following description when considered in connection with vthe accompanying drawing showing a diagrammatic view of one form and arrangement of apparatusand circuits embodyinof this invention, n

In this drawing reference characters 1 and 2 designate the switchboard conductors of an operators cord circuit, which conductors aresupplied with current byl a battery 3 connected in .series with the usual transformer or repeating coil 4:. Relays 7 normally associate the switchboard conductors with the front and back cordsvof the cord circuit. A number of subscribers and cen-.1

tral station jacks are provided 0n` the switchboard with which'jacks the operator. u may` associate the plugs of the. cord circuit in setting up connections in the usual manner. but for'the sake of simplicity only two of these `iacks, '.8 and 8a, are shown on the drawing. f i c ringing key. In the meantime, however, a

To 'ring the subscriber associated with Jack' 8 lthe operator inserts the plug of the front cord into the jack and depresses the ringing key 9. Contact 10 of the key connects ground'tot-he winding of relay- 7 and c-ausesthe same to close its front' contacts and associate a source of ringing current withthe subscribers set. This current-continues toflow until the operator releases the lockingl relay' 11 has become energized kby reason of the closure of contact 10a of the (key, the energizing circuit 0i thel relay eX@ tending from a battery 12 through the contact of a supervisoryrelay', the conduc tors 13 and 14, winding 11%, conductor 15 and contact 10a of key9 toground. After l relay 11 has closed its front contacts 'it is maintained energized by current in y its locking circuit, which extends lfrombattery 12 through the contact of the supervisory relay i 5, conductors 13 and 14e, winding 111", contact 16, wirel?, andy through the sleeve con-r tact of the yjack Sunto ground. Theflockingl circuit is independentof the contacts' of the ringingA key, being controlled only bythe' supervisory relay.Y `5 and the j sleeve Icontact ot the jack, and relay11 consequently remains energized when the operator releases the ringing key.

' Relay 11 controls a devicefforapplying intermittent ringing current to i the subiscribers set, this device comprisinga motor 2O which-is mechanically connected Ito'v a carn. 21 .provided lwith an .abutment for `operating a'y Contact 22. Contact 19-of relay` 411 controls the .circuitpo the inotorl and when the `relayis energized'by the depression of the rlngingkethe motor rotates the-cam .and causes thus anintermittent operation of contact 22,. Relay 7` f is controlled by contact 22 by means kof a circuit extending from batteryv 40 through the winding `or relay 7', `wire 24,'contact- 23 of, relay 11, wire 41 and contact 22 to ground; 'y This circuitcauses' an intermittent energiz-ation of relay -"('l and conse-` quently an intermittent flow ofjringing current through the subscribers set.

I. W hen the SubsOriberlanSWers, he closes,

in taking the receiver off` thel hook, na path for the direct current from bzfzttery. 1Th1s currentflows over the switchboard conclue a Vtors andenergizes thesupervisory relay,

which isassociated with conductor 2 across vthe terminals of a shuntf having low im@ 4pedance to the alternating voice currents.

Y The Y* ivisory lamp 30 is controlled in the usual manner by the supervisory relay 5 and by the contacts or the listening key 3l, the circuit ot the lamp extending 'from ground through battery l@ through the contact of supervisory rela y conductor i3 and 32, contact 33 ot key 3l, wire Se, lamp 30, wire l? and sleeve contact ot' jack 8 to ground. li. battery 35 is provided torturnisliinc' current to the sleeve' contact ot the jack wnen relay ll is deenergized, this vcurrent being necessary for the operation ot certain instrumcntalities associated with the sleeve contact of central station jacks, which instrumentalities however', do not relate to this invention and have, therefore, not been shown in the drawing.

rThe apparatus associated with the back cord is similar to that of the front cord and the above description applies equally well thereto, like parts being designated by like characters or" reference. y

ilthough 'only one 'form `oL embodiment of this invention is shown and described herein, it lis readily understood. that various changes and modiiicationsmay be made therein within the scope or the 'following claims without 'departing 'trom 'the spirit and scope of this invention.

' TWhat is claimed is:

l. ln combination, a cord circuit comprising voice conductors, a supervisory relay serially connected in the `talking circuit, a

ringing key, a locking relay, an energizing circuit therefor controlled by said key, and alocking circuit therefor controlled by said supervisory relay, a source ot ringing current and a single coil relay, responsive to either said locking `,re-lay or said ringing key for 'associatin'g` said source 'with said cord circuit.

Q ln combination, a cord 'circu y a jack for receiving the plug 'of said cord circuit, a Contact associated with said 'plug andjack, a supervisory relay associated with said cord circuit, a "ringingv key, a locking relay, an energizing circuit therefor controlled by said key and said supervisory relay, but independent ot said plug'and jack contact, and a locking circuit therefor controlled by said supervisory relay and by said plug and .jack contact, a source of ringingcurrent, and a relay controlled by said locking relay for associating` said source with said cord circuit. n

3. ln combination, a cord circuit comprising voice conductors, a superi'zisory relay in Aseries with the 'voice Conductors, a ringing 'circu key, a locking relay, an energizing circuit therefor controlled by said key and a locking circuit therefor controlled by said supervisory relay, a source ot ringing current, a relay tor associating said source with said cord circuit, kmeans operated by said ringing key for causing a response ot said relay while said key is in operated position, and an intermittent contact controlled by said locking relay :tor causing an intermittent association oit said ringing source when said key has returned to normal position.

4l. ln combination, a cord circuit, jack for receiving the plugot said cord circuit, a contact associated vvithsaid plug and jack, a s pervisory relay associated with said cord circui a ringing key, a locking relay, an encre; z og circuit therefor controlled by saidgkey but independent ot said plug and jack contact, and aflocking circuit therefor controlled Vby said supervisory relay and `by said plug and jack contact, an intermittent contact device controlled by said locking relay, a source ot ringing current, a Arelay 'lor associating said source with said cord circuit, a circuit for said relay governed by said key and independent or" said supervisory relay, and another circuit therefor controlled by intermittent .contact and said locking relay. i

5. ln combination, acord circuit comprising voice conductors, a source 'of taking current associated therewith, a supervisory 'relay 'serially connected in lthe talking t a vsource oi ringing current, a relay 'for internii'ttentl'y associating said source ot ringing *current with said circuit and intermittently disrupting the continuity of the voice conductors ,of

the said circuit and a contact for preventing` the operation ol2 said relay, said contact being controlled by the series supervisory relay.

6.y In combination, a cord circuit comprising voice conductors, a source of ringing current, a rst relay for interrupting said voice conductors and tor 'associating said source with said voice conductors, a key for causing initial operation 'of said relay, a second relay, an energizing circuittherefor governed by said key, a jack, a locking circuit for said second relay governed by rSaid jack, a supervisory relay serially connected in the talking lle@ lay, an energizing circuit therefor governed by said key, a jack, a'loclring circuit for said second relay governed by said jack, a supervisory relay for governing said energizing and vlocking circuits, a motor governed'by said second relay, a camoperated by said.` y motor, a contact intermittently operatedy by,

said cani and a circuit 'for said rst relay governed by said second ielay-andv by said intermittent contact for causing an intermit tent operation of said irst relayv subse-` quently to said initial operation thereof.

8; Iln combination, a symmetrical cord cirlay, a similar set of elements associated' in v the other side of saideord circuit, a source of ringing `current' and a relay on each side of said cordcircuit, each of said relays being responsive respectively either to its locking relay or its ringing key Jfor associating vsaidy vringing source with the corresponding side of said cord circuit.

9. ln combination, a pairof'svvitchboardconductors, a battery bridged across said conductors, a cord,-a source of ringing current,

a ringing relay, means for causing' saidrelay to connect said source for said Switchff board conductorsin series With said eoidaccordiiig to vits operated or non-operated pbsition,y a ackv 'for'receivingthe plug ofsaid` cord, a contact associatedvwith Said plug and yacli, aringing lrey, a looking relay, aiienerj-y gizing vcircuit vtherefor responsive to an" `actuation -oi' said ringing ykey butindependen't,`-rv

ofgsaid plug'andjaclr contact, a locking circuit tliereor governed by said plug and jack said switchboard conductors and responsive io contact, a supervisory relay in series with?l-`v` to lovvfof .battery current in'said cord "conj ductors, and comprising .a Contact 'responsive to'- an energization of said supervisory relay.

for opening both vsaidenergizing andlockiiig f -circuits of said locking relay,- an intermittent Contact device, means for `controllingthe op` eration of said device by said lockingprelay, a n

first circuit for-said ringing lrelay' `governed by'said ringing lrey but'independent7`of'said v.

locking relay vfor causing anfiminediate response ofsaid irstrelay to an actuation of the ringing liey,anda second Girmi-fitI for said ringingrelay governed by said ylo,cliniglrelay ,-and'said intermittent contact butindepenrb ent of said ringing key for causing subsequentlyfaninterinittent 'actuation of the f yringing relay."4 l i i f In'testiinony whereof, l have signed my nameto t-liisfspeciication thifsrd 'day of M June, 1919, i L

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